Partial Custom Enchantment Support

With my current system, custom enchantments cannot be supported individually without hard-coding each of them. However, I have added an overarching toggle to the config that allows you to modify the cap of all custom enchantments at once. (Ex: you can allow EVERY enchantment to go up to level #, or leave them all at their defaults)

Bugfixes

Fixed a corner case where you would receive the Too Expensive! warning if overleveled enchantments were not involved in the combination, but the level cost was over 39.